All patients will receive usual medical care before surgery and visit the clinic to meet with the surgeon and nurse/physician assistant, and undergo pre-operative laboratory testing. Patients in the intervention group will also meet with a member of the research team to complete a 10-item pre-test, to assess knowledge of the key concepts in the intervention, and then be presented with a 20-minute slide presentation. The presentation will educate patients on the: 1) definition of physical activity and its associated health benefits for the general population and people with arthritis, (2) 2008 Physical Activity Guidelines for Americans, 3) appropriate types of aerobic activities that patients should engage in after THA/TKA (e.g., no- or low-impact activities), (4) appropriate intensity level for activities after THA/TKA (e.g., at least moderate intensity), (5) appropriate duration of participation in activities (e.g., in increments of 10 or more minutes), and (6) the appropriate amount of activity per week (e.g., ≥ 2.5 hours [150 minutes]).